Exploring Power in Electrical and Mechanical Systems

The video tutorial explains the concepts of work and power in physics, highlighting how power is the rate of doing work or using energy over time. It introduces the unit of power, the Watt, and provides practical examples using light bulbs and hand cranks. The relationship between power, force, and velocity is discussed, and a challenge problem is presented to calculate power using given data. The tutorial concludes with a summary and additional resources for further learning.

What is the definition of work in physics?

• A change in mass

• A change in energy

• A change in temperature

• A change in velocity

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

How is power defined in physics?

• The amount of force applied

• The amount of work done in a given amount of time

• The amount of displacement

• The amount of energy stored

What is the unit of power in physics?

• Meter

• Watt

• Newton

• Joule

How much power does an older style incandescent light bulb use?

• 15 Watts

• 12 Watts

• 60 Watts

• 45 Watts

Which type of light bulb uses the least amount of power for the same brightness?

• Halogen bulb

• LED bulb

• CFL bulb

• Incandescent bulb

What is the relationship between power, force, and velocity?

• Power equals force divided by velocity

• Power equals force times velocity

• Power equals velocity divided by force

• Power equals force plus velocity

What happens to power when you increase the force exerted by an object?

• Power becomes zero

• Power increases

• Power remains the same

• Power decreases

What is the acceleration of a car that goes from 0 to 27 meters per second in 5 seconds?

• 6.4 meters per second squared

• 5.4 meters per second squared

• 3.4 meters per second squared

• 4.4 meters per second squared

Tags

NGSS.HS-PS2-1

What is the force exerted by a 1,000 kilogram car with an acceleration of 5.4 meters per second squared?

• 4,400 Newtons

• 5,400 Newtons

• 7,400 Newtons

• 6,400 Newtons

Tags

NGSS.HS-PS2-1

How much power is used by a car with a force of 5,400 Newtons and a velocity of 27 meters per second?

• 135,800 Watts

• 145,800 Watts

• 155,800 Watts

• 165,800 Watts